Conductive Glass Strand Coating for Joule Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional glass strands with electrically conducting coatings have low electrical conductivity, which limits their effectiveness in reinforcing composite materials while maintaining mechanical and chemical properties.
Innovation Solution
A conducting coating composition for glass strands comprising 6 to 50% film-forming agents, 5 to 40% conducting particles, 0 to 10% doping agents, 0 to 10% thickening agents, and 0 to 15% additives, applied in an aqueous medium, enhances electrical conductivity and mechanical cohesion, protecting against mechanical and chemical assaults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conducting coating compositions with low conducting particle content (5-15% by weight of solid matter) are used, then the coating can be applied easily and maintains good mechanical properties, but the electrical conductivity remains low
Solution Approach 1:
The patent changes the concentration parameter of conducting particles in the coating composition from the conventional 5-15% to 20-40% by weight of solid matter. This parameter change directly increases the electrical conductivity of the coating while maintaining formulation simplicity through the use of commercially available dispersants and binders.
2Reliability
If the content of conducting particles in the coating is increased to improve electrical conductivity, then higher conductivity is achieved, but the mechanical properties and adhesion may deteriorate
Solution Approach 1:
The patent introduces binder polymers (acrylic, vinyl, or styrene-based) as intermediary substances that mediate between the conducting particles and the glass strand substrate. These binders form a continuous matrix that holds the high concentration of conducting particles together and adheres them to the glass strand, preventing particle aggregation and maintaining mechanical integrity despite the high particle content (20-40%).
Solution Approach 2:
The patent creates a composite coating material consisting of conducting particles (graphite, carbon black, or metal powders) dispersed in a polymer binder matrix. This composite structure allows the coating to simultaneously exhibit high electrical conductivity from the conducting particles and good mechanical properties from the binder, resolving the contradiction between conductivity and strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The high electrical conductivity of the coated glass strands achieves improved mechanical properties and durability, suitable for composite materials that can be used for Joule effect heating and electromagnetic shielding.
Implementation Method 1
The glass strands and the glass strand structures in accordance with the invention have the ability to conduct the electrical current
Implementation Method 2
heating the said strands or the said structures, thus coated, at a temperature sufficient to remove the water and to strengthen the conducting coating
Implementation Method 3
During the manufacture of the strands, it protects the filaments from the abrasion resulting from the rubbing of the latter at high speed over the members of the process, acting as a lubricant
Implementation Method 4
It also makes it possible to remove the electrostatic charges generating during this rubbing
Data Source
AI summary
The invention relates to glass strands and glass strand structures coated with an electrically conducting coating composition which comprises (as % by weight of solid matter):6 to 50% of a film-forming agent, preferably 6 to 45%,5 to 40% of at least one compound chosen from plasticizing agents, surface-active agents and/or dispersing agents,20 to 75% of electrically conducting particles,0 to 10% of a doping agent,0 to 10% of a thickening agent,0 to 15% of additives.The invention also relates to the electrically conducting coating composition used to coat the said strands and strand structures, to their process of manufacture and to the composite materials including these strands or strand structures.Application to the preparation of structures and composite materials which can be heated by the Joule effect or which can be used for electromagnetic shielding.